Virtualized Access Layer. Petr Grygárek
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1 Virtualized Access Layer Petr Grygárek
2 Goals Integrate physical network with virtualized access layer switches Hypervisor vswitch Handle logical network connection of multiple (migrating) OS images hosted on physical server(s) Apply network policies to virtualized switches and virtualized network attachments QoS, ACLs & security profiles, During VM migration, policies have to be migrated with VM Unified management & policies of both physical and logical network elements Connects together server administrator s and network administrator s views and processes Network awareness of inter-vm traffic Policy enforcement, statistics, packet capture, Avoid extending of STP domain
3 Possible solution approaches 1. Implement standard network functions and APIs into software-based virtual switches E.g. Cisco Nexus1000V 2. Avoid local switching and forward traffic from individual remote virtual NICs to physical switch for processing via separate logical channels Dynamically create corresponding logical veth interface on HW switch to provide configuration and feature consistency Suitable when vertical traffic prevails Which does not 100% apply anymore in current DC models with horizontally-scalable applications
4 802.1Qbg - Edge Virtual Bridging Defines multiple technologies Virtual Ethernet Bridge (VEB) (roughly corresponds to VMWare vswitch) L2 inter-vm communication VLAN support Virtual Ethernet Port Aggregator (VEPA) hypervisor forwards even inter-vm traffic to external switch No MAC address learning & flooding needed external switch s monitoring and security tools can be enforced Switching function can also be built into CNA Standard Mode (tagless) external switch needs to be able to forward frame back to the port which the frame came from (modified standard behaviour) reflective relay Multi-channel - QinQ between hypervisor and external switch multiple logical attachment points for individual VNICs Broadcast/multicast replication on controller switch
5 IEEE 802.1BR - Bridge Port Extension (1) (originally started in 802.1qbh) Defines Extended bridge Standardized alternative to proprietary technologies like Cisco FEX Model of controlling (physical) bridge + Port Extender(s) managed as single entity (port extenders can be understood as remote I/O cards) no local switching - all traffic goes via controlling switch support for remote HW-based multicast/broadcast traffic replication E-channel - logical channel between Extended port and corresponding virtual interface on controlling switch E-Tag - E-channel ID, contained in modified Ethernet frames equivalent of Cisco VNTag (=slightly different format built on 802.1BR prestandard) Port extenders may be cascaded example: controlling switch - FEX BR-compatible server NIC (NIC virtualization) BR-compatible hypervisors on blade servers connected to each virtualized switch VM Allows multiple network layers to be managed as single device/layer Tags are NOT stacked Tag- to-port mapping table still needed in Port Extenders Tags are learnt together with MAC addresses on controlling SW
6 IEEE 802.1BR - Bridge Port Extension (2)
7 Port Extender Functionality As simple as possible Northbound: add tag based on receiving (virtual) port & forward Southbound: forward based on DST VIF Remove E-Tag at a last hop
8 Bridge Port Extension Use Cases Physical server NIC adapter partitioning ("Adapter-FEX") multiple simulated NICs presented by BIOS/PCI to OS, single attachment link to physical switch tens of simulated NICs are currently supported Ethernet vnics or FibreChannel HBAs dual uplink provides seamless redundancy of virtualized server NICs active+standby mode, NIC teaming in OS does not need to be configured Virtualized physical VM-to-physical switch connection fixed VEths (e.g. Redhat, Windows, VMWare ESX hypervisors) floating veths (e.g. VMWare ESX hypervisors)
9 VNTag/E-Tag header fields Presence of VNTag/Etag (4B) identified by special EtherType value (2B) VNTag header may be followed by 802.1q header Frame fields Direction: indicates whether frame travels from or to remote adapter Source VIF (12b) Looped flag: frame looped by physical switch back to the same adapter (inter-vnic switching) Needed to avoid broadcast/multicast cycles Destination VIF (12b) / VIF_List if Pointer bit is specified, VIF_List is used to specify destination VIFs to replicate the frame
10 Port extender to controller switch Interactions Port extender reports number of ports to upstream switch upstream switch automatically creates corresponding number of tags associating each tag with single extender port
11 802.1q versus VNTag 802.1q trunk is treated by physical switch as a single port in terms of applied policies Policies mostly cannot be applied per-vlan All VLANs (trunk) extended to the host, server admin has to properly selects VLAN to be fed to individual VMs extension of (per-vlan) STP domains to the host VNTag creates virtual interfaces corresponding to vnics that can be assigned separate policies veths treated the same way as ordinary ports by switch operating system
12 Cisco Nexus 5000 Static veth Configuration Example inteface veth 1 switchport mode trunk bind interface Ethernet101/1/2 channel 3 101/1/2 identifies physical downlink interface (FEX-attached VNTag-capable host) Channel 3 identifes VIF
13 Cisco Nexus 5000 Dynamic veth Configuration Example N5K registers itself to vsphere as vds and reports its configured port profiles Profile can be seen as port-group in vcengter Server administrator defines channel # and profile for each vnic vethernet autocreate interface Ethernet1/10 switchport mode vntag // FEX downlink port-profile type vethernet MYPROFILE switchport mode access switchport access vlan 60 port-binding dynamic state enabled // created automatically interface vethernet bind interface ethernet 1/10 channel <# defined on server> inherit port-profile MYPROFILE
14 References: Related IEEE standards: Comparisons of related standards (Cisco) 2/whitepaper_c _ps10277_Products_White_Paper.html Cisco FEX standards: 4/qa_c pdf VNTag & IEEE standards Virtual Ethernet Bridging pdf
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